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 ###Instrução: Qual é o número total de operações de manutenção da paz nas quais cada país participou?
 ###Tabelas: 
CREATE TABLE if not exists peacekeeping (year INT, country TEXT, operation TEXT, troops INT); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2015, 'Country A', 'Peacekeeping Operation 1', 500); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2016, 'Country A', 'Peacekeeping Operation 1', 550); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2015, 'Country A', 'Peacekeeping Operation 2', 600); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2016, 'Country A', 'Peacekeeping Operation 2', 650); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2015, 'Country B', 'Peacekeeping Operation 1', 300); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2016, 'Country B', 'Peacekeeping Operation 1', 350); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2015, 'Country B', 'Peacekeeping Operation 2', 400); INSERT INTO peacekeeping (year, country, operation, troops) VALUES (2016, 'Country B', 'Peacekeeping Operation 2', 450);
SELECT country, SUM(troops) as total_troops FROM peacekeeping GROUP BY country;